51976809 has 20 divisors (see below), whose sum is σ = 79455376. Its totient is φ = 33843096.

The previous prime is 51976789. The next prime is 51976831. The reversal of 51976809 is 90867915.

It is not a de Polignac number, because 51976809 - 2⁷ = 51976681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51976879) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3979 + ... + 10944.

Almost surely, 2^51976809 is an apocalyptic number.

It is an amenable number.

51976809 is a deficient number, since it is larger than the sum of its proper divisors (27478567).

51976809 is a wasteful number, since it uses less digits than its factorization.

51976809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14978 (or 14969 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 51976809 is about 7209.4943650717. The cubic root of 51976809 is about 373.1956198243.

The spelling of 51976809 in words is "fifty-one million, nine hundred seventy-six thousand, eight hundred nine".